#include "stdio.h"

void byteorder() {
  union {
    short value;
    char union_bytes[sizeof(short)];
  } test;
  test.value = 0x0102;
  if ((test.union_bytes[0] == 1) && (test.union_bytes[1] == 2)) {
    printf("big endian\n");
  } else if ((test.union_bytes[0] == 2) && (test.union_bytes[1] == 1)) {
    printf("little endian\n");
  } else {
    printf("unknown...\n");
  }
}

int main() {
  byteorder();
  return 0;
}